EP3928145A1 - Hmd visor assembly - Google Patents
Hmd visor assemblyInfo
- Publication number
- EP3928145A1 EP3928145A1 EP20710674.1A EP20710674A EP3928145A1 EP 3928145 A1 EP3928145 A1 EP 3928145A1 EP 20710674 A EP20710674 A EP 20710674A EP 3928145 A1 EP3928145 A1 EP 3928145A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- visor
- bathtub
- molded
- opaque
- opaque region
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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- 238000000034 method Methods 0.000 claims description 26
- 230000000903 blocking effect Effects 0.000 claims description 24
- 230000003287 optical effect Effects 0.000 claims description 19
- 229920005668 polycarbonate resin Polymers 0.000 claims description 13
- 239000004431 polycarbonate resin Substances 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 239000003973 paint Substances 0.000 claims description 5
- 239000006117 anti-reflective coating Substances 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 description 16
- 238000003754 machining Methods 0.000 description 16
- 230000003190 augmentative effect Effects 0.000 description 11
- 239000000463 material Substances 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 8
- 238000000465 moulding Methods 0.000 description 6
- 230000003667 anti-reflective effect Effects 0.000 description 5
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0176—Head mounted characterised by mechanical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0179—Display position adjusting means not related to the information to be displayed
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
- G02B5/223—Absorbing filters containing organic substances, e.g. dyes, inks or pigments
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
- G02B2027/0174—Head mounted characterised by optical features holographic
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0179—Display position adjusting means not related to the information to be displayed
- G02B2027/0187—Display position adjusting means not related to the information to be displayed slaved to motion of at least a part of the body of the user, e.g. head, eye
Definitions
- Augmented reality systems often use a head mounted display (HMD) which allows the user to view the actual environment, but which also includes functionality for displaying virtual objects to the user in the actual environment. This is often accomplished by having sensors in the HMD that are able to sense characteristics of the actual environment, sense user movements, and then based on the sensed characteristics of the actual environment and the sensed user movement, display virtual objects in the actual environment to the user.
- HMD head mounted display
- an augmented reality system may be able to sense a table in an actual environment.
- the augmented reality system can also detect that a user using an augmented reality system is facing the table.
- the augmented reality system can cause a virtual object to be displayed to the user on the table.
- the user can perform various gestures to interact with the virtual object on the table. For example, the user could“pick-up” the virtual object,“move” the virtual object, view different perspectives of the virtual object, etc.
- an HMD may need to perform several functions to provide an optimal augmented reality experience, and different regions of the HMD may require different optical properties in order to perform each of these functions (e.g., head tracking, depth tracking, eye tracking, hand tracking, virtual object display, optical transmission of real- world environment).
- Another important goal is to include all necessary optical regions in the HMD in a cohesive and visually appealing arrangement/configuration.
- Figure 1 illustrates an exploded view of a machined visor assembly comprising a visor and a bathtub
- Figure 2 illustrates top, front, and cross-sectional side views of the machined visor assembly
- Figure 3 illustrates an isometric view of the machined visor assembly
- Figure 4 illustrates rear, bottom, and cross-sectional side views of the visor as molded, before machining
- Figure 5 illustrates front, top, and cross-sectional side views of the visor as molded, before machining
- Figure 6 illustrates front, top, and cross-sectional side views of the visor after machining
- Figure 7 illustrates front and rear views of the visor before machining
- Figure 8 illustrates a front view of the visor before machining, indicating various optical regions of the visor
- Figure 10 illustrates top and cross-sectional side views of the bathtub before machining
- Figure 11 illustrates top and front views of the bathtub before machining
- Figure 12 illustrates front and bottom views of the bathtub after machining
- Figure 14 illustrates a rear view of the visor and illustrates mask areas for the visor
- Figure 15 illustrates a front view of the bathtub and illustrates mask areas for the bathtub
- Figure 16 illustrates a perspective view of a depth window and illustrates mask areas for the depth window
- Figure 18 illustrates an exemplary flow diagram depicting a method for using a head mounted display visor assembly.
- Embodiments illustrated herein are generally directed to an HMD visor assembly having various features that improve user experience with augmented reality systems.
- some embodiments of the HMD visor assembly include features that block external IR light from affecting IR sensors and/or visible and/or IR light from affecting hologram images projected by the HMD by including IR blocking materials in a front facing external surface.
- Some embodiments of the HMD visor assembly include elements to provide anti -reflection (AR) and anti-smear (AS) coating on various external facing surfaces.
- AR anti -reflection
- AS anti-smear
- Some embodiments of the HMD visor assembly include AR coatings on various internal facing surfaces.
- Some embodiments of the HMD visor assembly include a portion that allows IR light, from IR light emitters, directed at a user’s eye for eye tracking while blocking visible light from the sensors. Some embodiments of the HMD visor assembly include a window that allows for IR light to be transmitted through an otherwise IR opaque region of the assembly to allow for a depth sensor to be world-facing for the HMD visor assembly.
- a unique design and manufacturing method create an HMD visor that has no user-visible mechanical mounting features (when installed to the HMD) and eliminates manufacturing tolerances by design for favorable device aesthetics.
- the HMD product involves a cosmetic see-through enclosure referred to, and illustrated in Figure 1, in an exploded view, and in Figure 2 as the visor assembly 100, which has several features.
- the visor assembly 100 includes at least two elements: a first visor element (referred to herein as visor 102) and a second visor element (referred to herein as bathtub 104).
- visor 102 a first visor element
- bathtub 104 a second visor element
- bathtub 104 refers to a second visor element of visor assembly 100.
- visor assembly 100 provides a 2-meter lensing element (e.g., included in the bathtub 104 illustrated below) that focuses holograms at a distance of 2m.
- the bathtub 104 may include two plano-concave (spherical) lenses 105 with a focal length of 2 meters.
- a visual light permissive portion of the bathtub 104 is configured to operate as at least part of an optical system (e.g., an optical system including the bathtub 104 and one or more other display elements disposed between the bathtub 104 and the visor 102 in the HMD) for focusing one or more holograms displayed by the HMD at a predefined distance (e.g., 2 meters or another distance) from the HMD visor assembly 100
- an optical system e.g., an optical system including the bathtub 104 and one or more other display elements disposed between the bathtub 104 and the visor 102 in the HMD
- the visor assembly 100 protects the sensitive displays of the HMD from user touch or mechanical contact during shock or drop events by disposing these elements in a cavity 106 (see Figure 2) existing between a visor 102 and bathtub 104.
- the visor assembly 100 hides a series of retinal glint LEDs used for the purpose of eye tracking by including an IR permissive, but visually opaque portion (i.e., secondary opaque region 120, see Figure 13A) on the bathtub 104, behind which the LEDs can be disposed.
- an IR permissive, but visually opaque portion i.e., secondary opaque region 120, see Figure 13A
- the visor assembly 100 creates a seamless continuous visual appearance for the product.
- the shape of the finished visor assembly 100 illustrated in Figures 2 and 3 would be difficult or impossible to mold, coat, and assemble as a single part (e.g., it would not de mold, and would have shadows during anti -reflective (AR) and/or anti-smear (AS) coating).
- the visor assembly therefore, is separately molded initially as two parts referred to as the visor 102 as illustrated in Figures 4-8 and the bathtub 104 as illustrated in Figures 9-13B, wherein the visor is the world-facing portion of the visor assembly 100 and the bathtub is the user-facing portion of the visor assembly 100.
- the visor 102 is molded, in some embodiments, from a polycarbonate resin, such as Mitsubishi Lupilon CLS3400 PC. In some instances, the visor 102 is color-matched to have a 46% translucent neutral gray color.
- the bathtub 104 in some embodiments, is molded from a polycarbonate resin, such as Mitsubishi Lupilon CLS3400 PC, being 95% translucent.
- utilizing an only partially translucent visor assembly 100 in an HMD causes the real-world environment of a user to appear partially darkened/tinted to the user. In some implementations, this improves the contrast between the hologram(s) displayed to the user on the HMD and the user’s real-world environment (e.g., preventing a bright real-world environment from washing out holograms displayed on the HMD). It will be appreciated, however, that the particular use of a 46% translucent gray color with the polycarbonate resin for the visor 102 and a 95% translucent polycarbonate resin for the bathtub 104 is non-limiting, and other resins with other colors and/or translucent characteristics are within the scope of this disclosure.
- an IR blocking material e.g., a near IR absorption dye
- the IR blocking material helps to prevent stray IR light from interfering with IR sensors of the HMD (e.g., depth tracking sensors, eye tracking sensors).
- the visor 102 formed with the polycarbonate resin and IR absorption dye transmits visible light (e.g., 450-700nm) at an average of 48% ⁇ 2% for 1.2 mm optical pathlength (ignoring reflection losses) and transmits IR light at ⁇ 20% for wavelengths from 760-930nm and ⁇ 15% for wavelengths from 830-900nm (infrared).
- visible light e.g., 450-700nm
- IR absorption dye transmits visible light at an average of 48% ⁇ 2% for 1.2 mm optical pathlength (ignoring reflection losses) and transmits IR light at ⁇ 20% for wavelengths from 760-930nm and ⁇ 15% for wavelengths from 830-900nm (infrared).
- the bathtub 104 has no IR blocking dye included in the polycarbonate used for forming the bathtub 104, in particular because IR light must transmit through at least a portion of the bathtub 104 in order to carry out eye tracking functionalities. This will be described in more detail hereinbelow.
- the two parts (i.e., the visor 102 and the bathtub 104) of the visor assembly 100 have overlapping extensions 108 shown in Figures 4, 5, 7-11, and 13A-13B.
- the overlapping extensions 108 are used to mate the visor 102 and the bathtub 104, and a portion of the overlapping extensions 108 will be machined away in later portions of the assembly process ( Figures 1-3, 6, and 14-15 illustrate the visor assembly 100 or elements thereof after a portion of the overlapping extensions 108 has been machined away).
- Several things can be accomplished by performing this mating and machining process. For example, in some embodiments, uniform resin flow can be accomplished during molding.
- stress- fringes which in some instances concentrate around the edges of the mold, can be reduced. This is accomplished, in part, because the stress fringes concentrate on the portion of the overlapping extensions 108 that will be removed after the visor 102 and the bathtub 104 are adhered together. After removal of these portions, visor assembly 100 has a high see-thru optical quality.
- Embodiments may include an overflow blocking wall 114 feature on the bathtub 104 such that the dispensed adhesive does not overflow into the user-visible portion of the visor assembly 100.
- the blocking wall 114 directs the overflow of adhesive 112 outward toward the perimeter of the visor assembly 100, thus preventing the adhesive from overflowing into the user-visible portion of the visor assembly.
- the blocking wall 114 of the bathtub 104 is 0.2 mm high although it will be recognized that other heights may be utilized, such as 0.05 mm, 0.1 mm, 0.15 mm, 0.25 mm, 0.3 mm, or any other value.
- the two parts of the visor assembly 100 i.e., the visor 102 and the bathtub 104) are bonded using a clear (visible see-though) UV-curable adhesive 112.
- a clear (visible see-though) UV-curable adhesive 112. Once cured, embodiments CNC-machine away a portion of the overlapping extensions 108 of both parts together in the bonded state so that there is no dimensional mismatch between the two parts once finished (see Figures 1-3 for results of machining).
- Act 1710 includes applying an antireflective (AR) coating to the visor and the bathtub.
- AR antireflective
- the antireflective coating prevents reflections between the various optical regions of the molded visor and the separately molded bathtub from distorting or corrupting the functioning of the head mounted display visor assembly (e.g., for depth sensing, eye tracking, display of holograms and/or real-world environments).
- Act 1714 includes bonding the visor to the bathtub.
- the molded visor and the separately molded bathtub include overlapping extensions for aligning the molded visor with the separately molded bathtub. These overlapping extensions, in some instances, include holes or other alignment features for aligning the molded visor to the separately molded bathtub.
- bonding the molded visor to the separately molded bathtub is accomplished by applying an adhesive to the overlapping extensions of the molded visor and the separately molded bathtub, such that the adhesive couples the molded visor to the separately molded bathtub.
- the adhesive is a UV-curable adhesive, such as DYMAX 3099VT.
- the bathtub includes a blocking wall, which separates the overlapping extensions of the bathtub from the visible light permissive region and the IR permissive, but visible light opaque region of the bathtub.
- Act 1716 includes removing a portion of the overlapping extensions. After bonding the molded visor to the separately molded bathtub, in some embodiments, at least a portion of the overlapping extensions of the visor and the bathtub may be removed (e.g., the alignment features of the overlapping extensions are no longer needed after the parts are bonded together). In some instances, the removal of the portion of the overlapping extensions gives the combined visor and bathtub a near seamless visual appearance, since no over-extending ridge for facilitating attachment is visible. In some embodiments, the portion of the overlapping extensions is removed via CNC machining.
- Act 1718 includes affixing a separately manufactured IR window to the visor.
- the separately manufactured IR window blocks visible light but transmits IR light, and is affixed to the window frame of the molded visor.
- the IR window allows the HMD to perform depth detection utilizing IR reflections/scattering off of real-world environmental objects. Because the IR window and the molded visor are separately manufactured, internal reflections between the two that might compromise the integrity of depth measurements are avoided.
- the IR window can include various coatings applied thereto, such as HC, AR, and AS coatings.
- the window frame of the molded visor sits, in some embodiments, at the top portion of the molded visor in-line with the IR opaque and visible light opaque region of the molded visor.
- FIG. 18 shows an exemplary flow diagram depicting a method 1800 for manufacturing a head mounted display visor assembly.
- method 1800 includes acts of obtaining a head mounted display including a head mounted display visor assembly (1802), displaying one or more holograms on a display of the head mounted display (1804), transmitting display light through the visible light permissive region of the bathtub (1806), focusing the hologram(s) at a predefined distance from the head mounted display (1808), transmitting visible environmental light through the IR opaque region of the visor, the display, and the visible light permissive region of the bathtub (1810), transmitting eye tracking IR light through the IR permissive, but visible light opaque region of the bathtub (1812), transmitting IR environmental light reflections through the separately manufactured IR window (1814), absorbing the IR environmental light reflections at the IR opaque region and the IR opaque and visible light opaque region of the visor (1816), absorbing visible environmental light at the IR opaque and visible light opaque region of the molded visor (1818), and absorbing visible visible light through
- act 1802 includes obtaining a head mounted display including a head mounted display visor assembly.
- the head mounted display visor assembly corresponds to one manufactured in accordance with method 1700 described hereinabove.
- the head mounted display visor assembly includes a molded visor with an IR opaque region and an IR opaque and visible light opaque region at the top of the visor which is adjacent to and above the IR opaque region.
- the molded visor also has a separately manufactured IR window coupled to the IR opaque and the visible light opaque region.
- the head mounted display visor assembly includes a separately molded bathtub, which is coupled to the visor and includes an IR permissive, but visible light opaque region at the top of the bathtub, and a visible light permissive region adjacent to the IR permissive, but visible light opaque region.
- Act 1804 includes displaying one or more holograms on a display of the head mounted display.
- the display is situated between the molded visor and the separately molded bathtub of the head mounted display visor assembly.
- act 1806 includes transmitting display light through the visible light permissive region of the bathtub (which is between the user and the aforementioned display) to an eye of the user.
- act 1808 includes focusing the hologram(s) at a predefined distance from the head mounted display.
- the separately molded bathtub includes lenses and operates as at least part of an optical system of the HMD (e.g., including the separately molded bathtub and the display) for focusing the hologram(s) at the predefined distance.
- the predefined distance is 2 meters.
- Act 1814 includes transmitting IR environmental light reflections through the separately manufactured IR window.
- the IR light that causes the IR light reflections in the user’s real-world environment may be emitted from the HMD, another device (such as a dedicated IR light emitter specifically for depth tracking purposes), or natural sources (e.g., the sun).
- These IR environmental light reflections transmit through the separately manufactured IR window, which is visible light opaque, but IR light permissive.
- the IR light is detected, for example, by one or more IR detection devices for tracking the depth of the objects in the user’s real-world environment.
- act 1816 includes absorbing the IR environmental light reflections at the IR opaque region and the IR opaque and visible light opaque region of the visor.
- the IR environmental light reflections that impinge on the IR opaque region and the IR opaque and visible light opaque region of the molded visor are absorbed by these regions of the visor, in particular because the visor is formed with an IR absorption material. In some instances, this prevents the environmental light from interfering with one or more eye tracking IR sensors and/or depth sensors.
- act 1820 includes absorbing visible environmental light at the IR permissive, but visible light opaque region of the bathtub.
- the IR permissive, but visible light opaque region of the bathtub is situated between the user and one or more IR light emitters (for eye tracking) such that the IR permissive, but visible light opaque region substantially prevents visible light from reaching the IR light emitters. Thus, in some embodiments, this obscures the IR light emitter(s) from view.
- the IR permissive, but visible light opaque region of the bathtub obscures one or more mounting elements of the bathtub and/or the visor assembly from view. These features can preserve the seamless visual appearance of the head mounted display visor assembly.
- the bathtub has a plano-concave shape with a radius of curvature of 1374.669 mm, a center thickness of 0.9 mm, and an x decenter of 0 mm and a y decenter of -1.6696 mm.
- the visor 102 has a scratch-dig surface quality specification of 60-40 for the entire front surface (world-facing surface) and the optical apertures of the back surface (user-facing surface). Furthermore, in some instances, the visor 102 has a root mean square surface roughness of less than 6 nm for all optical apertures on the front surface and the back surface.
- the bathtub 104 has a scratch-dig surface quality specification of 60-40 for the entire front surface (world-facing surface) and the optical apertures of the back surface (user-facing surface). Furthermore, in some instances, the bathtub has a root mean square surface roughness of less than 6 nm for all optical apertures on the front surface and the back surface.
- the bathtub 104 may have a light transmission of min>85% 0 ⁇ 50deg angle of incidence at 850nm ⁇ 30nm, and after the AR coating is applied, the bathtub 104 may have a light transmission of min>90% and avg>94% for 0 ⁇ 50deg angle of incidence at wavelengths of 450-700nm.
- the bathtub 104 may have a hardness of HB at 50g for the entire front surface and a water contact angle of greater than 100 degrees. Further, the bathtub 104 may have a transmitted wavefront error (slope) of ⁇ 0.079um/mm measured over 1mm period, corresponding to a ⁇ 0.25 wave PV at 633nm for 2mm aperture, or ⁇ 0.129mrad ray angle change, and a transmitted wavefront error (peak to valley) of ⁇ 3 micrometers for the clear aperture (relative to prescription). In addition, bathtub 104 has, in some embodiments, a haze of less than 1% and UV blocking characteristics of less than 0.03 W/m 2 for wavelengths of 320-400nm. Still furthermore, in some implementations, the visor 102 allows up to 3 bubbles/inclusions up to 10 micrometers in size in the manufacturing process.
- the secondary opaque region 120 (i.e., the IR permissive, but visual light opaque portion of the bathtub 104) transmits visible light (e.g., from 400 nm to 700 nm) at less then 10%, and transmits IR light (e.g., 0 ⁇ 50deg at 850 ⁇ 30nm) at greater than 85%, and has 60-40 surface quality.
- the depth window 126 transmits p-polarized IR light (e.g., wavelengths 840-890 nm) at a minimum of 90% at 0 degree angle of incidence, a minimum of 90% at 40 degree angle of incidence, and a minimum of 80% at 70 degree angle of incidence. Furthermore, in some embodiments, the depth window 126 transmits unpolarized IR light (e.g., wavelengths 840-890 nm) at a minimum of 90% at 0 degree angle of incidence, a minimum of 86% at 40 degree angle of incidence, and a minimum of 62% at 70 degree angle of incidence.
- p-polarized IR light e.g., wavelengths 840-890 nm
- unpolarized IR light e.g., wavelengths 840-890 nm
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201962809597P | 2019-02-23 | 2019-02-23 | |
US16/393,600 US11163160B2 (en) | 2019-02-23 | 2019-04-24 | HMD visor assembly |
PCT/US2020/017570 WO2020171999A1 (en) | 2019-02-23 | 2020-02-11 | Hmd visor assembly |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3928145A1 true EP3928145A1 (en) | 2021-12-29 |
Family
ID=72142493
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20710674.1A Withdrawn EP3928145A1 (en) | 2019-02-23 | 2020-02-11 | Hmd visor assembly |
Country Status (3)
Country | Link |
---|---|
US (1) | US11163160B2 (en) |
EP (1) | EP3928145A1 (en) |
WO (1) | WO2020171999A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11442280B2 (en) * | 2019-04-23 | 2022-09-13 | Valve Corporation | Adjustable head-mounted display to accommodate different head and face sizes |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6023372A (en) * | 1997-10-30 | 2000-02-08 | The Microoptical Corporation | Light weight, compact remountable electronic display device for eyeglasses or other head-borne eyewear frames |
US9851564B2 (en) | 2015-01-20 | 2017-12-26 | Microsoft Technology Licensing, Llc | Head-mounted display device with protective visor |
US9585285B2 (en) | 2015-01-20 | 2017-02-28 | Microsoft Technology Licensing, Llc | Heat dissipation structure for an electronic device |
US9851478B2 (en) | 2016-02-10 | 2017-12-26 | Microsoft Technology Licensing, Llc | Optical cross talk mitigation for optical device having disrupting features formed on a shield |
-
2019
- 2019-04-24 US US16/393,600 patent/US11163160B2/en active Active
-
2020
- 2020-02-11 WO PCT/US2020/017570 patent/WO2020171999A1/en unknown
- 2020-02-11 EP EP20710674.1A patent/EP3928145A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
US11163160B2 (en) | 2021-11-02 |
US20200271933A1 (en) | 2020-08-27 |
WO2020171999A1 (en) | 2020-08-27 |
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